html,
body {
    background: #111 url('../img/bg.png');
    background-size: cover;
    font-family: sans-serif;
    height: 100%;
    margin: 0 auto;
    text-align: center;
    width: 100%;
}

iframe {
    border: none;
    margin: 30px auto;
}

.warning {
    display: none;
}

.warning.on {
    display: block;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: #ff0;
    padding: 1rem;
}

.button {
    background: #33cd5f;
    border: solid 1px #28a54c;
    border-radius: 4px;
    color: #fff;
    cursor: pointer;
    display: block;
    font-size: 14px;
    margin: 0 auto 30px;
    padding-bottom: 10px;
    padding-top: 10px;
    width: 400px;
    transition: all 0.25s ease-in-out;
}

.button:hover,
.button:active {
    background: #009E2D;
    border-color: #007722;
}
